Within 28 days of the start of the second course of induction chemotherapy, patients receive high-dose ifosfamide IV over 17 hours, carboplatin IV over 3 hours, and etoposide phosphate IV over 3 hours on days 1-4. At 48 hours after completion of high-dose chemotherapy, patients undergo autologous PBSC or bone marrow transplantation and then receive G-CSF SC for 14 days. Treatment repeats every 28 days for 3 courses.